Steam generator



- Nov. 24, 1931. w. J. WOHLENBERG 1,833,508

STEAM GENERATOR Filed Dec. 29. 1928 HZ i Q A TTORNEYS.

Patented Nov. 24, 1931 UNITE D STATES PATENT OFFICE WALTER J. WOI-ILENIBERG, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO ERIE CITY IRON WORKS, F ERIE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA STEAM GENERATQR I Application filed December 29, 1928.

The present invention is designed to improve a steam generator involving a boiler of the Stirlin type and a connected water wall. It'is desirable in an apparatus of this kind to provide for a free circulation in the boiler proper and also a circulation through the water walls which will not be disturbed by, or disturb materially the boiler circulation. One of the objects of the present invention is to accomplishthis; The invention is further directed to simplifying the construction, making each of its elements capable of efficient operation, and so arranging the parts as to correct for variations in expansion and 5 contraction. Features and details will appear from the specification and claims.

A preferred embodiment of the invention is illustrated in the accompanying drawings as follows Fig. 1 shows a section on the line 1-1 in Fig. 2. r

Fig. 2 a front elevation of the generator. 1 marks the front upper drum, 2 the rear upper drum, 3 the lower drum, 4 front tubes connecting the drums 1 andQ, and 5 up er tubes connecting the drums 1 and 2,and6tu es connecting the drums 2 and 3. This is a typical threedrum boiler in which there is a circulation, the tubes 6 forming the down-flow tubes, the tubes 4 the up-fiow tubes, and 5 the connecting steam and water tubes between the drums 1 and 2, the flow being from the front drum to the rear.

The water wall system for the furnace comprises tubes 7 in the side walls. These are preferably inwardly deflected at 7a giving to the lower part of the system a basket form r leaving a space 7?) for the discharge of ash. The tubes 7 follow. the line of the furnace wall, as indicated by dash lines and extend into an upper 7 wall tube header 8. The wall tubes 7 terminate at their lower ends in a lower wall tube header- 9. The upper wall tube header has an up-flow header, or riser 10. Thisis connected by bent tubes ll'with the end of the rear drum, the tubes 11 extending radially and outwardly from the front face of the rear drum. A down-comer tube 12 leads to Serial N0. 329,128.

the lower wall tube header 9 and terminates in a down-comer header 13. The header 13 is connected by bent tubes 14 with the end of the rear drum 2, these tubes 14 extending from the lower face of the rear drum, the headers 9 and 10 being arranged at an angle to each other so as to properly distribute these connecting tubes and further to facilitate a natural flow through them.

The wall system, just described, with the connecting headers and tubes is duplicated at both sides of the furnace. The position of the furnace walls is indicated by dotted lines and it will be noticed that the downcomer tubes are arranged without these Walls so that there is no heat transfer to them to interfere with the down-flow of water through them. It will also be noticed that the rear drum is somewhat longer than the front drum so as to afford space for the connection of the tubes 11 and 1- It will be seen that the wall system is directly connected for its circulation through one drum and this drum is subjected to less fluctuation in water levels and steam agitation than the front drum. Consequently the levels effecting the wall'system are maintained reasonably constant and it will be noted that the circulation in the boiler which passes through the rear drum follows through the drum to a large extent independently of the circulation of the wall system. On the other hand, the wall system passing to and from the drum affords a perfect release for any steam that may be generated in the wall system and a complete circulation within each wall system without disturbing materially the main circuit of the boiler. The two systems, however, are completely tied together so that there is no possibility of a failure in either system so long as there is water in the generator as a whole.

It will be noted also that the down-comer tubes lead to the front ends of the header and the upper header discharges to the riser 10 at its front end. Thus there is a balanced resistance in total flow through each of the Wall tubes 7 and in consequence a substantially equal flow through each of the tubes 7 so that all parts of the furnace wall are equally cooled.

What I claimas new is 1 In a steam generator, the combination of a boiler comprising a plurality of upper :drums and boiler tubes included with said tween the risers and the ends bfthe rear drum, said connectionsradiating'from adjacent-to the ends of said rear drum; downcomer headers; connections between the down-comerhe'aders and the ends of said' "rear drum,'said connections radiating from adjacent to the ends of said rear drum; and

'clowii-coiiiertiibes leading from-said down comer headers to the lower headers. '2, In a'steam'generator, the combination of a boiler comprising a plurality of upper drums and boiler'tubes included with said drums forming a circulatin system; water tubes arranged in groups in'planes at opposite ends of the drums an upper and lower header for each of said groups, said headers being connected-as headers with said groups of tubes; connecting headers arranged as ris- 'ers from the upper headers; connectionsbe- I tween 'the'risers and the ends of" the'rear drum, said'connections radiating from adacent to the ends of said rear drum downcoiner' headers; connections between the down-comer headers and the ends} of said rear drum, saidconnections-radiating from ad acent to the ends of said reardrum; and,

down-comer tubes leading from said downconier --headers to the, lower headers, the down-"comer tubes leading to the front ends of the lower headers and the risers leading from the rear ends of the upper headers;

3. Ina steam generator, the combination of a'boiler comprising a drum and boiler.

tubes included with said drum forming-a circulating systein; furnace wall .tubes arr'anged-ina groupextending from one end of said drum; an upper header having a riser adjacent the endof said drum; tube connections bQJWQEH the. riser and the end of the drum, said connections radiating from adjacent to the end of the drum; a lower header for the wall tubes, said lower header being connected as a' header with said wall tubes; a down-comer header arranged at anan gle totheriser and below the GHClOl the. drum; connections bet tween the down comer header. and vthe end of the drum, said connections radiating from v adjacent to theend'of the drum; and a con nection'between the down-comer header and the lower'hea'der. 7 lQIn a. steam generator, the combination or" a boiler comp-risin'gadrumand boiler tubes end of said drum, said header being connected as a header with saidwall tubes; tube connections between the riser and the end of the drum, said connections radiating from adjacent to the end 01": the drum; a lower header for the wall tubes; a down-comer header arranged atan an'gleto' the riser and below the drum; connections between the down-comer header and theend of the drum,

saidconnect-ions radiating from adjacent to the end of the drum; and a connection between the down-comer header and the lower header, said last-mentioned connection exten-dingto'the opposite end of the lower headerfironrthat from which the riser, extends froin the upper header; 7

5sln a steam generator, the combination of a boiler comprisinga drum and boiler tubes included with said drum forming a circulating system; furnace wall tubes arranged in a group ext riding from one end of said drum; an upper headerhaving a riser adjacentthe. end of said drum, said header being connected as a header with said well tubes; tube connections between the riser and the end of the drum, said tubes radiating adjacent to the end of the drum; a lower header for the wall tubes; down-comer header arranged at an angle to the riser, said Clownconier header being below the'drum; connorti'ons between the down-comer header and the end ot'the drum, said connections radiating i roinadjacent tothe end of the drum; and

aconnection between the down-comer header and the lower header,- the connections between the doWn -corner header and the drum being in the form or" curved tubes, the clowncomer header being arranged outside of the endof the-Idruin- V In a steam generator the combination of a boiler comprising a drum and boiler tubes included withsaiddrum forming a circulating system furnace 'walltubes arranged in a groupextending from one end of said druni; an upper header having a riser adjacent the end of said drunnsaid header being connected as a lieader'with said wall tubes; tube connections between the riserj'and the end'of the drum, said tubes radiating adjacent to the endof the drum; a lower header for the wall tubes;- a( down-comer header arranged at i'an 'angletotlie riser, said down- ,conier header being belowthe drum; connections between the down-corner header and the end oftlie drum; and a connection between the down-corner header and the-lower header,

the connections betweenithe riser and downcomer header and the drum being in the form of curvedltubes, said riser and downcomer headerbeing outside ofthe endof the drum; j a

7. In a steam generator, the combination of a boiler comprising a plurality of upper drums and boiler tubes included With said drums forming a circulating system; furnace wall-tubes arranged in groups in planes at the ends of the drums; upper and lower headers for said furnace wall tubes, said headers being connected as headers with said wall tubes; connecting headers in the form of risers leading from said upper headers; conec ions in the form of bent tubes extending from the risers to the ends of the rear drum,

said tubes radiating from the drum adjacent to its ends; down-comer headers arranged at an angle to the risers and arranged below the drum; bent tubes connecting said downcomer headers and the ends of the rear drum, said tubes radiating from the drum adjacent I to its ends; and down-comer tubes connecting the down-corner headers with the lower headers.

8. In a boiler, the combination of an upper rear drum and tubes operating herewith and completing a circulating system; wall tubes arranged in the plane of the end of the drum, said tubes being bent inwardly toward their lower end to form a floor for a furnace; headers for the lower and upper ends of said wall tubes, said headers being connected as headers with said wall tubes; risers in continuation of the upper headers; tube connections between the risers and the upper rear drum, said connections radiating from adjacent to V the ends of the rear drum; down-comer headers below the risers; tube connections between the down-comer headers and the upper rear drums, said tube connections radiating from the rear drum in approximately the same plane as the connections leading to the risers; and connections between the downconier headers and the lower wall tube headers.

In testimony whereof I have hereunto set my hand.

WALTER J. WOHLENBERG. 

